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Mental Math. A Life Long Skill. Why Mental Math?. Calculating in you head is a practical life skill. Mental math can make written computation easier or quicker Proficiency in mental math contributes to increased skill in estimation - PowerPoint PPT Presentation
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Why Mental Math?• Calculating in you head is a practical life skill.• Mental math can make written computation
easier or quicker• Proficiency in mental math contributes to
increased skill in estimation• Mental calculation can lead to a better
understanding of place value, mathematical operations, and basic number sense.
• It is new a challenge each day• Bi-weekly draws• OUR BRAIN IS WITH US WHEREVER WE GO,
OUR CALCULATOR IS NOT!!
Guidelines for Mental Math• Mental math is DAILY, but not necessarily a
test daily• Each test will be 10 questions• 5 seconds to answer each question• Test is self corrected, you recorded results• name goes in for a draw (1, 2, 3 chances)• If corrected incorrectly no chance to win
during the next draw.• If no red pen, no tickets for that day• Unprepared for three classes eliminates
you from that weeks draw.• Strategies used will be discussed
Mental Math # 11) The operation associated with the term addend is ?2) The operation associated with the term quotient is ?3) The operation associated with the term factor is ?4) The operation associated with the term dividend is ?5) The operation associated with the term product is ?6) The operation associated with the term minuend is ?7) The operation associated with the term sum is ?8) The operation associated with the term subtrahend is ?9) The operation associated with the term is divisor?10) The operation associated with the term is difference ?
Mental Math # 11) The operation associated with the term addend is +
2) The operation associated with the term quotient is 3) The operation associated with the term factor is x
4) The operation associated with the term dividend is 5) The operation associated with the term product is x6) The operation associated with the term minuend is -7) The operation associated with the term sum is +8) The operation associated with the term subtrahend is -
9) The operation associated with the term is divisor 10) The operation associated with the term is difference -
Mental Math # 21) 70 + 43 = 1132) 10 + 70 + 3 = 833) 200 - 50 = 1504) 50 – 10 = 405) 500 - 200 = 3006) 4 x 4 = 167) 4 x 300 = 12008) 50 10 = 59) 8 4 = 210)40 1 = 40
Name the term
represented by the number that is blue.
Mental Math # 21) 70 + 43 (addend) = 1132) 10 + 70 + 3 = 83 (sum)3) 200 (minuend) - 50 = 1504) 50 – 10 = 40 (difference)5) 500 - 200 (subtrahend) = 3006) 4 (factor) x 4 = 167) 4 x 300 = 120 (product)8) 50 10 = 5 (quotient)9) 8 4 (divisor) = 210)40 (dividend) 1 = 40
Mental Math # 31) 70 x 40 = 28002) 500 + 43 = 5433) 20 5 = 44) 20 x 50 = 10005) 700 – 300 = 4006) 50 + 50 = 1007) 30 2 = 158) 50 - 10 = 40 9) 8 4 = 2 10)100 - 40 = 60
Name the term
represented by the number that is blue.
Mental Math # 31) 70 x 40 (factor) = 28002) 500 + 43 = 543 (sum)3) 20 (dividend) 5 = 44) 20 (factor) x 50 = 10005) 700 (minuend) – 300 = 4006) 50 (addend) + 50 = 1007) 30 2 (divisor) = 158) 50 - 10 = 40 (difference)9) 8 4 = 2 (quotient) 10)100 - 40 (subtrahend) = 60
Mental Math # 41) When you multiply 2 numbers, the result is called the ?2) The numbers you add together to get a result are called
the ?3) How many you take away from the amount you started
with is called the ?4) The amount you start with when dividing is called the ?5) The result of dividing 2 numbers is called the ?6) To find a product, the numbers you multiply are called ?7) The result of 2 numbers added together is called the ?8) The number of equal groups you want to make when
dividing is called the ?9) The amount you get when subtracting two numbers is
called the ?10) The amount you start with when subtracting is called
the ?
Mental Math # 41) When you multiply 2 numbers, the result is called the
product.2) The numbers you add together to get a result are called
the addends.3) How many you take away from the amount you started
with is called the subtrahend.4) The amount you start with when dividing is called the
dividend.5) The result of dividing 2 numbers is called the quotient.6) To find a product, the numbers you multiply are called
factors.7) The result of 2 numbers added together is called the sum.8) The number of equal groups you want to make when
dividing is called the divisor.9) The amount you get when subtracting two numbers is
called the difference.10) The amount you start with when subtracting is called the
minuend.
Mental Math # 51) The product of 5 and 2 is ?2) The sum of 5 and 2 is ?3) The factors are 3 and 5; the result is ?4) The difference of 10 and 8 is ?5) 4 x 100 + 8 x 1 + 5 x 1000 =6) 50 000 + 3000 + 20 + 7 =7) 500 + 300 + 40 =8) 80 + 40 + 20 + 2 =9) 4000 + 500 + 3000 + 20 =10)The quotient is 5, the divisor is 6
what is the dividend?
Mental Math # 51) The product of 5 and 2 is ? 102) The sum of 5 and 2 is ? 73) The factors are 3 and 5; the result is?
154) The difference of 10 and 8 is ? 25) 4 x 100 + 8 x 1 + 5 x 1000 = 54086) 50 000 + 3000 + 20 + 7 = 53 0277) 500 + 300 + 40 = 8408) 80 + 40 + 20 + 2 = 1429) 4000 + 500 + 3000 + 20 = 752010)The quotient is 5, the divisor is 6 what
is the dividend? 30
Mental Math # 61) 7000 + 300 + 40 + 3 =2) 9000 + 70 + 3 =3) 2000 + 50 + 400 + 4 =4) 50 + 4000 + 7 + 300 =5) 5 x 1000 + 3 x 100 + 9 x 10 + 2 x 1
=6) 4 x 100 + 8 x 1 + 5 x 1000 =7) 50 000 + 3000 + 20 + 7 =8) 500 + 300 + 40 =9) 80 + 40 + 20 + 2 =10)4000 + 500 + 3000 + 20 =
Mental Math # 61) 7000 + 300 + 40 + 3 = 73432) 9000 + 70 + 3 = 90733) 2000 + 50 + 400 + 4 = 24544) 50 + 4000 + 7 + 300 = 43575) 5 x 1000 + 3 x 100 + 9 x 10 + 2 x 1
= 53926) 4 x 100 + 8 x 1 + 5 x 1000 = 54087) 50 000 + 3000 + 20 + 7 = 53 0278) 500 + 300 + 40 = 8409) 80 + 40 + 20 + 2 = 14210)4000 + 500 + 3000 + 20 = 7520
Mental Math # 71) 500 + 3000 + 70 + 3 =2) 6000 + 700 + 33) 2000 + 500 + 40 + 4 =4) 50 000 + 30 + 7 + 8000 =5) 3 x 10 000 + 1 x 1000 + 9 x 100 +
2 x 10 + 3 x 1 =6) 4 x 1000 + 2 x 1 + 5 x 100 =7) 200 + 300 + 20 + 5 =8) 500 + 500 + 400 + 24 =9) 40 + 60 + 20 + 70 + 30 =10)4200 + 500 + 60 =
Mental Math # 71) 500 + 3000 + 70 + 3 = 35732) 6000 + 700 + 3 = 67033) 2000 + 500 + 40 + 4 = 25444) 50 000 + 30 + 7 + 8000 = 58 0375) 3 x 10 000 + 1 x 1000 + 9 x 100 +
2 x 10 + 3 x 1 = 31 9236) 4 x 1000 + 2 x 1 + 5 x 100 = 45027) 200 + 300 + 20 + 5 = 5258) 500 + 500 + 400 + 24 = 14249) 40 + 60 + 20 + 70 + 30 = 22010)4200 + 500 + 60 = 4760
Mental Math # 81) 90 + 7000 + 500 + 6 =2) 60 000 + 400 + 20 + 3 =3) 300 + 700 + 80 + 4 =4) 50 000 + 30 + 7 + 8000 =5) 3 x 1000 + 9 x 100 + 6 x 10 + 2 x 1
=6) 4 x 1000 + 2 x 10 000 + 8 x 100 =7) 20 + 80 + 30 + 5 + 70 =8) 900 + 600 + 400 + 72 + 100 =9) 2000 + 8000 + 700 + 30 =10)5100 + 900 + 70 =
Mental Math # 81) 90 + 7000 + 500 + 6 = 75962) 60 000 + 400 + 20 + 3 = 60 4233) 300 + 700 + 80 + 4 = 10844) 50 000 + 30 + 7 + 8000 = 58 0375) 3 x 1000 + 9 x 100 + 6 x 10 + 2 x 1 =
39626) 4 x 1000 + 2 x 10 000 + 8 x 100 = 24 8007) 20 + 80 + 30 + 5 + 70 = 2058) 900 + 600 + 400 + 72 + 100 = 20729) 2000 + 8000 + 700 + 30 = 10 73010)5100 + 900 + 70 = 6070
Mental Math # 91) 20 + 6000 + 400 + 7 =2) 50 000 + 9000 + 200 + 30 =3) 400 + 600 + 3 + 40 =4) 20 000 + 300 + 9 + 4000 =5) 5 x 1000 + 3 x 100 + 7 x 10 + 2 x 1
=6) 7 x 1000 + 8 x 10 000 + 6 x 100 =7) 50 + 90 + 50 + 5 + 10 =8) 300 + 600 + 700 + 42 =9) 4000 + 500 + 500 + 33 =10)3700 + 300 + 76 =
Mental Math # 91) 20 + 6000 + 400 + 7 = 64272) 50 000 + 9000 + 200 + 30 = 59 2303) 400 + 600 + 3 + 40 = 10434) 20 000 + 300 + 9 + 4000 = 24 3095) 5 x 1000 + 3 x 100 + 7 x 10 + 2 x 1 =
53726) 7 x 1000 + 8 x 10 000 + 6 x 100 = 87 6007) 50 + 90 + 50 + 5 + 10 = 2058) 300 + 600 + 700 + 42 = 16429) 4000 + 500 + 500 + 33 = 503310) 3700 + 300 + 76 = 4076
Mental Math # 101) 8 x 8 = 2) 5 x 9= 3) 4 x 6 = 4) 20 divided by 5 = 5) 3 x 7 = 6) 72 divided by 9 = 7) 7 x 8 = 8) 30 divided by 6 = 9) 7 x 7 = 10) 60 divided by 6 =
Mental Math # 101) 8 x 8 = 642) 5 x 9= 453) 4 x 6 = 244) 20 divided by 5 = 45) 3 x 7 = 216) 72 divided by 9 = 87) 7 x 8 = 568) 30 divided by 6 = 59) 7 x 7 = 4910) 60 divided by 6 = 10
Mental Math # 111) 4 x 8 = 2) 3 x 9= 3) 7 x 5 = 4) 36 divided by 6 = 5) 9 x 9 = 6) 56 divided by 7 = 7) 2 x 8 = 8) 55 divided by 5 = 9) 7 x 6 = 10) 64 divided by 8 =
Mental Math # 111) 4 x 8 = 322) 3 x 9= 273) 7 x 5 = 354) 36 divided by 6 = 65) 9 x 9 = 816) 56 divided by 7 = 87) 2 x 8 = 168) 55 divided by 5 = 119) 7 x 6 = 4210) 64 divided by 8 = 8
Mental Math # 121) 4 x 3 = 2) 6 x 8= 3) 8 x 5 = 4) 63 divided by 9 = 5) 4 x 7 = 6) 32 divided by 4 = 7) 2 x 12 = 8) 72 divided by 8 = 9) 7 x 7 = 10) 48 divided by 8 =
Mental Math # 121) 4 x 3 = 122) 6 x 8= 483) 8 x 5 = 404) 63 divided by 9 = 75) 4 x 7 = 286) 32 divided by 4 = 87) 2 x 12 = 248) 72 divided by 8 = 99) 7 x 7 = 4910) 48 divided by 8 = 6
Mental Math # 131) 8 x 3 = 2) 9 x 8= 3) 9 x 6 = 4) 36 divided by 9 = 5) 4 x 4 = 6) 40 divided by 5 = 7) 3 x 12 = 8) 42 divided by 6 = 9) 7 x 4 = 10) 64 divided by 8 =
Mental Math # 131) 8 x 3 = 242) 9 x 8= 723) 9 x 6 = 544) 36 divided by 9 = 45) 4 x 4 = 166) 40 divided by 5 = 87) 3 x 12 = 368) 42 divided by 6 = 79) 7 x 4 = 2810) 64 divided by 8 = 8
Mental Math # 141) 200 + 60 000 + 4 + 70 = 2) 50 + 80 + 90 + 20 + 10 = 3) 400 + 600 + 3000 + 400 = 4) 23 + 300 + 7 = 5) 6 x 1000 + 2 x 100 + 0 x 10 + 2 x 1 = 6) 9 x 1000 + 8 x 10 000 + 6 x 100 + 4 x
10 = 7) 9 + 7 = 8) 90 + 70 = 9) 139 + 7 = 10)390 + 70 =
Mental Math # 141) 200 + 60 000 + 4 + 70 = 60 2742) 50 + 80 + 90 + 20 + 10 = 2503) 400 + 600 + 3000 + 400 = 44004) 23 + 300 + 7 = 3305) 6 x 1000 + 2 x 100 + 0 x 10 + 2 x 1 =
62026) 9 x 1000 + 8 x 10 000 + 6 x 100 + 4 x
10 = 89 6407) 9 + 7 = 168) 90 + 70 = 1609) 139 + 7 = 14610)390 + 70 = 460
Mental Math # 151) 500 + 20 + 500 + 80 = 2) 30 + 80 + 70 + 10 + 10 = 3) 200 + 800 + 30 + 400 = 4) 51 + 3000 + 9 = 5) 8 x 1000 + 3 x 100 + 4 x 10 + 4 x 1
= 6) 9 x 10 000 + 8 x 1 + 6 x 1000 = 7) 7 + 5 = 8) 70 + 50 = 9) 127 + 5 = 10)330 + 37 =
Mental Math # 151) 500 + 20 + 500 + 80 = 11002) 30 + 80 + 70 + 10 + 10 = 2003) 200 + 800 + 30 + 400 = 14304) 51 + 3000 + 9 = 30605) 8 x 1000 + 3 x 100 + 4 x 10 + 4 x 1
= 83446) 9 x 10 000 + 8 x 1 + 6 x 1000 = 96
0087) 7 + 5 = 128) 70 + 50 = 1209) 127 + 5 = 13210)330 + 37 = 367
Mental Math # 161) 48 + 21 =2) 53 + 34 = 3) 34 + 52 =4) 456 + 120 = 5) 438 + 340 =6) 629 + 310 =7) 400 + 231 =8) 456 + 42 =9) 381 + 405 =10)705 + 220 =
Mental Math # 161) 48 + 21 = 692) 53 + 34 = 873) 34 + 52 = 864) 456 + 120 = 5765) 438 + 340 = 7786) 629 + 310 = 9397) 400 + 231 = 6318) 456 + 42 = 4989) 381 + 405 = 78610)705 + 220 = 925
Mental Math # 171) 430 + 53 = 2) 510 + 87 = 3) 349 + 220 = 4) 456 + 440 = 5) 352 + 527 = 6) 600 + 350 = 7) 434 + 231 = 8) 156 + 420 = 9) 321 + 45 = 10)615 + 224 =
Mental Math # 171) 430 + 53 = 4832) 510 + 87 = 5973) 349 + 220 = 5694) 456 + 440 = 8965) 352 + 527 = 8796) 600 + 350 = 9507) 434 + 231 = 6658) 156 + 420 = 5769) 321 + 45 = 36610)615 + 224 = 839
Mental Math # 181) 974 + 23 = 2) 320 + 29 = 3) 341 + 208 = 4) 677 + 320 = 5) 425 + 563 = 6) 60 + 322 = 7) 400 + 231 = 8) 424 + 424 = 9) 333 + 425 = 10)610 + 220 =
Mental Math # 181) 974 + 23 = 9972) 320 + 29 = 3493) 341 + 208 = 5494) 677 + 320 = 9975) 425 + 563 = 9886) 60 + 322 = 3827) 400 + 231 = 6318) 424 + 424 = 8489) 333 + 425 = 75810)610 + 220 = 830
Mental Math # 191) 543 + 253 = 2) 841 + 200 = 3) 128 + 331 = 4) 415 + 363 = 5) 52 + 315 = 6) 400 + 200 + 387 = 7) 398 + 502 = 8) 260 + 540 = 9) 390 + 208 = 10) 111 + 111 + 111 =
Mental Math # 191) 543 + 253 = 7962) 841 + 200 = 10413) 128 + 331 = 4594) 415 + 363 = 7785) 52 + 315 = 3676) 400 + 200 + 387 = 9877) 398 + 502 = 9008) 260 + 540 = 8009) 390 + 208 = 59810) 111 + 111 + 111 = 333
Mental Math # 201) Five and three tenths = 2) Thirty two and four hundredths = 3) Seventy-seven thousandths = 4) Two hundred four and five hundredths
= 5) Nine hundredths = 6) 4 + 0.2 = 7) 30 + 5 + 0.9 + 0.07 = 8) 200 + 0.8 = 9) (5 x 1) + (2 x 0.1) + (4 x 0.01) = 10) 3 x 100 + 6 x 0.01 =
Mental Math # 201) Five and three tenths = 5.32) Thirty two and four hundredths =
32.043) Seventy-seven thousandths = 0.0774) Two hundred four and five
hundredths = 204.055) Nine hundredths = 0.096) 4 + 0.2 = 4.27) 30 + 5 + 0.9 + 0.07 = 35.978) 200 + 0.8 = 200.89) (5 x 1) + (2 x 0.1) + (4 x 0.01) = 5.2410) 3 x 100 + 6 x 0.01 = 300.06
Mental Math # 211) Nine and three hundredths = 2) Thirty two and four tenths = 3) Seven thousandths = 4) Three hundred and fifteen
thousandths = 5) Nine hundredths = 6) 5 + 0.2 + 0.06 = 7) 300 + 50 + 0.9 + 0.04 = 8) 20 + 0.08 + 3 = 9) (5 x 0.001) + (2 x 0.01) + (4 x 0.1) = 10) 3 x 100 + 6 x 0.1 + 4 x 1 =
Mental Math # 211) Nine and three hundredths = 9.032) Thirty two and four tenths = 32.43) Seven thousandths = 0.0074) Three hundred and fifteen
thousandths = 300.0155) Nine hundredths = 0.096) 5 + 0.2 + 0.06 = 5.267) 300 + 50 + 0.9 + 0.04 = 350.948) 20 + 0.08 + 3 = 23.089) (5 x 0.001) + (2 x 0.01) + (4 x 0.1) =
0.42510) 3 x 100 + 6 x 0.1 + 4 x 1 = 304.6
One Whole
Mental Math # 221)
2)
3)
4)
5)
6)
7)
8)
9)
10)
Mental Math # 221)
One and four tenths or
1.4
2)
Fifty-threehundredths or
0.53
3)
One and threehundredths or
1.03
4)
One andTwo tenths or
1.2
5)
One and thirty-four
thousandths or 1. 034
6)
Five thousandths or 0.005
7)
One and thirteen thousandths or
1.013
8)
Two and one hundred forty-
two thousandths or 2.142
9)
Twenty-two thousandths or
0.022
10)
One and five hundredths or
1.05
Mental Math # 231)
2)
3)
4)
5)
One Whole
Mental Math # 236)
7)
8)
9)
10)
One Whole
Mental Math # 231)
2)
3)
4)
5)
1.1341.134
2.0162.016
1.3081.308
2.1532.153
4.2314.231
Mental Math # 236)
7)
8)
9)
10)
1.1091.109
2.2212.221
1.0061.006
0.3420.342
4.034.03
Mental Math # 241)
2)
3)
4)
5)
One Whole
Mental Math # 246)
7)
8)
9)
10)
One Whole
Mental Math # 241)
2)
3)
4)
5)
One Whole
1.131.13
10.3710.37
21.3321.33
5.045.04
33.61
33.61
Mental Math # 246)
7)
8)
9)
10)
One Whole
15.315.3
1.031.03
3.323.32
10.510.5
1.21.2
Mental Math # 251)
2)
3)
4)
5)
One Whole
Mental Math # 256)
7)
8)
9)
10)
One Whole
Mental Math # 251)
2)
3)
4)
5)
One Whole
2.052.05
0.720.72
0.40.4
13.0613.06
30.0430.04
Mental Math # 256)
7)
8)
9)
10)
One Whole
13.01
13.01
1.131.13
2.52.5
0.420.42
1.271.27
Mental Math # 261) 3.25 or 3.5 2) 2.000 or 2.0013) 0.98 or 0.89 =4) 98.9 or 98.195) 10.01 or 10.010 =6) 6.6 or 6.607) Two hundredths or two thousandths
=8) 1.9 or 0.9999) 1 or 0.95 =10) 636 or 663 =
Mental Math # 261) 3.25 or 3.5 2) 2.000 or 2.0013) 0.98 or 0.89 4) 98.9 or 98.195) 10.01 or 10.010 6) 6.6 or 6.607) Two hundredths or two thousandths 8) 1.9 or 0.9999) 1 or 0.95 10) 636 or 663
Mental Math # 271) 3.25 rounded to the nearest tenth =2) 234.9 rounded to the nearest whole
number =3) 1.984 rounded to the nearest hundredth =4) 48.9 rounded to the nearest ten =5) 10.08 rounded to the nearest tenth =6) 6.6 rounded to the nearest whole number =7) 1465.9 rounded to the nearest hundred =8) 7.3 rounded to the nearest whole number =9) 0.6544 rounded to the nearest thousandths
=10) 1.95 rounded to the nearest tenth =
Mental Math # 271) 3.25 rounded to the nearest tenth = 3.32) 234.9 rounded to the nearest whole number =
2353) 1.984 rounded to the nearest hundredth = 1.984) 48.9 rounded to the nearest ten = 505) 10.08 rounded to the nearest tenth = 10.16) 6.6 rounded to the nearest whole number = 77) 1465.9 rounded to the nearest hundred = 15008) 7.3 rounded to the nearest whole number = 79) 0.6544 rounded to the nearest thousandths =
0.65410) 1.95 rounded to the nearest tenth = 2
Mental Math # 281) 9.252 rounded to the nearest hundredth = 2) 2399 rounded to the nearest thousand = 3) 5.984 rounded to the nearest tenth = 4) 48.55 rounded to the nearest tenth = 5) 10.087 rounded to the nearest hundredth = 6) 8.8 rounded to the nearest whole number =7) 7535.9 rounded to the nearest hundred = 8) 7.22 rounded to the nearest whole number = 9) 0.9999 rounded to the nearest thousandths = 10) 33.91 rounded to the nearest tenth =
Mental Math # 281) 9.252 rounded to the nearest hundredth = 9.252) 2399 rounded to the nearest thousand = 20003) 5.984 rounded to the nearest tenth = 64) 48.55 rounded to the nearest tenth = 48.65) 10.087 rounded to the nearest hundredth = 10.096) 8.8 rounded to the nearest whole number = 97) 7535.9 rounded to the nearest hundred = 75008) 7.22 rounded to the nearest whole number = 79) 0.9999 rounded to the nearest thousandths = 110) 33.91 rounded to the nearest tenth = 33.9
Mental Math # 291) 50 x 30 =2) 80 x 3 =3) 20 x 20 =4) 40 x 80 =5) 300 x 3 =6) 60 x 500 = 7) 800 x 50 =8) 900 x 20 =9) 60 x 90 =10) 40 x 300 =
Mental Math # 291) 50 x 30 = 15002) 80 x 3 = 2403) 20 x 20 = 4004) 40 x 80 = 32005) 300 x 3 = 9006) 60 x 500 = 30 0007) 800 x 50 = 40 0008) 900 x 20 = 18 0009) 60 x 90 = 540010) 40 x 300 = 12 000
Mental Math # 301) 10 x 30 =2) 3 x 500 =3) 2.4 x 2 =4) 5 x 80 =5) 100 x 38 =6) 6.2 x 2 = 7) 90 x 50 =8) 300 x 20 =9) 10 x 96 =10) 1.25 x 3 =
Mental Math # 301) 10 x 30 = 3002) 3 x 500 = 15003) 2.4 x 2 = 4.84) 5 x 80 = 4005) 100 x 38 = 38006) 6.2 x 2 = 12.47) 90 x 50 = 45008) 300 x 20 = 60009) 10 x 96 = 96010) 1.25 x 3 = 3.75
Mental Math # 311) 100 x 93 = 2) 30 x 70 = 3) 0.9 x 2 = 4) 50 x 60 = 5) 1 x 3.8 = 6) 10 x 3.8 = 7) 200 x 50 = 8) 30 x 40 = 9) 10 x 180 = 10) 1.99 x 2 =
Mental Math # 311) 100 x 93 = 93002) 30 x 70 = 21003) 0.9 x 2 = 1.84) 50 x 60 = 30005) 1 x 3.8 = 3.86) 10 x 3.8 = 387) 200 x 50 = 10 0008) 30 x 40 = 12009) 10 x 180 = 180010) 1.99 x 2 = 3.98
Mental Math # 32* denotes an estimate
1) 30 x 90 = 2) 5 x $9.13 = *3) 3 x $7.97 = *4) 7 x $2.06 = *5) $5.13 x 6 = *6) 5 x $3.89 = *7) 10 x 3.8 = 8) 300 x 50 = 9) 10 x 340 = 10) $1.98 x 2 = *
Mental Math # 321) 30 x 90 = 27002) 5 x $9.13 = $453) 3 x $7.97 = $244) 7 x $2.06 = $14 or 14.425) $5.13 x 6 = $306) 5 x 3.89 = $207) 10 x 3.8 = $388) 300 x 50 = 15 0009) 10 x 340 = 340010) $1.98 x 2 = $3.96 or $4.00
Mental Math # 33 * denotes an estimate
1) 20 x 700 = 2) 9 x $4.21 = *3) 9 x $0.97 = *4) 5 x $3.36 = *5) $5.13 x 6 = *6) 5 x 3.09 = *7) 1 x 5.9 =8) 10 x 5.9 = 9) 100 x 66 = 10) $1.05 x 3 =
Mental Math # 331) 20 x 700 = 14 0002) 9 x $4.21 = $363) 9 x $0.97 = $94) 5 x $3.36 = $15 5) $5.13 x 6 = $306) 5 x 3.09 = $15 or 15.457) 1 x 5.9 = 5.98) 10 x 5.9 = 599) 100 x 66 = 660010) $1.05 x 3 = $3.15 or $3.00
Mental Math # 341) 4 x 45 = 2) 97 x 2 = 3) 6 x 55 = 4) 5 x 36 = 5) 4 x 622 = 6) 34 x 3 = 7) 20 x 18 = 8) 7 x 56 = 9) 66 x 3 = 10) 52 x 7 =
Mental Math # 341) 4 x 45 = 1802) 97 x 2 = 1943) 6 x 55 = 3304) 5 x 36 = 1805) 4 x 622 = 24886) 34 x 3 = 1027) 20 x 18 = 3608) 7 x 56 = 3929) 66 x 3 = 19810) 52 x 7 = 364
Mental Math # 351) 45 x 5 = 2) 76 x 3 = 3) 61 x 5 = 4) 54 x 3 = 5) 4 x 62 = 6) 43 x 4 = 7) 3 x 91 = 8) 4 x 65 = 9) 9 x 32 = 10) 5 x 73 =
Mental Math # 351) 45 x 5 = 2252) 76 x 3 = 2283) 61 x 5 = 3054) 54 x 3 = 1625) 4 x 62 = 2486) 43 x 4 = 1727) 3 x 91 = 2738) 4 x 65 = 2609) 9 x 32 = 28810) 5 x 73 = 365
Mental Math # 361) 55 x 4 = 2) 92 x 5 = 3) 71 x 7 = 4) 4 x 71 = 5) 9 x 63 = 6) 20 x 49 = 7) 30 x 51 = 8) 3 x 77 = 9) 6 x 35 = 10) 63 x 7 =
Mental Math # 361) 55 x 4 = 2202) 92 x 5 = 4603) 71 x 7 = 4974) 4 x 71 = 2845) 9 x 63 = 5676) 20 x 49 = 9807) 30 x 51 = 15308) 3 x 77 = 2319) 6 x 35 = 21010) 63 x 7 = 441
Mental Math # 371) 10 x 7.5 = 2) 0.9 x 10 = 3) 100 x 0.97 = 4) 10 x 3.36 = 5) 5.13 x 100 = 6) 100 x 30.9 = 7) 10 x 0.018 = 8) 1000 x 5.9 = 9) 6.6 10 = 10) 1.05 x 10 =
Mental Math # 371) 10 x 7.5 = 752) 0.9 x 10 = 93) 100 x 0.97 = 974) 10 x 3.36 = 33.65) 5.13 x 100 = 5136) 100 x 30.9 = 30907) 10 x 0.018 = 0.188) 1000 x 5.9 = 59009) 6.6 10 = 0.6610) 1.05 x 10 = 10.5
Mental Math # 381) 100 x 39.1 = 2) 9.3 x 10 = 3) 10 x 0.93 = 4) 100 x 6.3 = 5) 3.4 10 = 6) 5.13 x 10 = 7) 10 x 30.9 = 8) 10 x 0.001 = 9) 1000 x 0.5 = 10)10.5 100 =
Mental Math # 381) 100 x 39.1 = 39102) 9.3 x 10 = 933) 10 x 0.93 = 9.34) 100 x 6.3 = 6305) 3.4 10 = 0.346) 5.13 x 10 = 51.37) 10 x 30.9 = 3098) 10 x 0.001 = 0.019) 1000 x 0.5 = 50010)10.5 100 = 0.105
Mental Math # 391) 45.1 10 = 2) 9.3 10 = 3) 67 10 = 4) 6.3 100 = 5) 3400 100 =6) 51.3 10 = 7) 10 x 39.1 =8) 413.1 100 =9) 2.5 1000 = 10)750.5 100 =
Mental Math # 391) 45.1 10 = 4.512) 9.3 10 = 0.933) 67 10 = 6.74) 6.3 100 = 0.0635) 3400 100 = 346) 51.3 10 = 5.137) 10 x 39.1 = 3918) 413.1 100 =4.1319) 2.5 1000 = 0.002510)750.5 100 = 7.505
Mental Math # 401) 83 100 = 2) 4.7 x 10 = 3) 69.2 10 = 4) 16.3 100 = 5) 30.4 10 = 6) 933 10 = 7) 10 x 92.1 = 8) 4 1000 =9) 2.5 100 = 10)5.2 10 =
Mental Math # 401) 83 100 = 0.832) 4.7 x 10 = 473) 69.2 10 = 6.924) 16.3 100 = 0.1635) 30.4 10 = 3.046) 933 10 = 93.37) 10 x 92.1 = 9218) 4 1000 =0.0049) 2.5 100 = 0.02510)5.2 10 = 0.52
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